Expandable window fan



FIG. 1 is a front elevational view of an expandable window fan showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a right side elevational view thereof, the left side being a mirror image of that shown. 

The ornamental design for an expandable window fan, as shown and described. 